Finding the Fourth Proportional to 1,978.38, 2,972.96 and 1,054.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.38 : 2,972.96 = 1,054.59 : x
2. Step 2: Convert to fraction form
   1,978.38/2,972.96 = 1,054.59/x
3. Step 3: Cross multiply
   1,978.38x = 2,972.96 × 1,054.59
4. Step 4: Simplify right side
   1,978.38x = 3,135,248.61
5. Step 5: Solve for x
   x = 3,135,248.61/1,978.38
6. Step 6: Final answer
   x = 1,584.76